Typewriting-machine



J. C. DOANE.

TYPEWRITING MACHINE.

APPLICATION FILED DEC-11.1918.

1,3 4, 1 23 Patented July 12, 1921.

2-SHEETS-SHEET 1- A War/7 J. C. DOANE.

TYPEWRITING MACHINE.

APPLICATION FILED 050.11, 1918.

1,2384 1 28", Patentefi July 12, 1921.

v 2 SHEETS-SHEET Cir WARE.

SIG-NOR TO UNDERW'OOD N. Y., A CORZOEATION OF DELA- TY?EW'BITING-IEACHINE.

Application filed December To all "70/2/0771 it may concern:

Be it known that I, Join: C. DOANE, a citizen of the United States, residing in East lilartford, in the county of Hartford and State of Connecticut, have invented cer tain new and useful Improvements in Typewriting-lilaehines, of which the following is a specification.

ilhis invention relates to typewriting machines and herein disclosed as applied to the platen scale of an Underwood typewritmachine, and is in the nature of an IG"c=111611t on my application, Serial No.

,325, tiled December 5,

1918. In said 7 there is disclosed a platen scale ipted to rise with the shifting Underwood typewriting ma- 1 the scale bears the same relaowe: posi ions of the platen, the scale resiliently mounted on swinging b ac ets, each having one edge adjacent the 1,said brackets adapted to swing so that c said edges follow the platen fairly closely.

in the present disclosure, means are provided to enable the platen scale to form part of a unitary bar or device which extends across the machine adjacent the top of the segment, and is adapted to have both ends moved simultaneously. To maintain the scale near the platen, brackets may be provided onv the sual segment adapted to carry swinging arms, so that the latter may hold the tale against the platen.

features and advantages will here ippear.

oinpanying era ings,

a 1 a perspective VlQW of an Unood ewriting machine showing my ention as applied thereto.

ig, h is a sectional side View of the same, ny parts being shown diagrammatieally, 1' being mitted.

Fig. 3 is a side vie v, partly in section, similar to Fig. but showing the platen in its upper-case position.

In the Underwood typewriting machine, character keys 1, when depressed, carry down their key-levers 9, thereby swinging sub-levers 3 to carry type-bars l upwardly and rearwardly, so that lower-case types 5 and upper-case types 6 on the type-bars will print against the front side of a platen 7, which is rotatably mounted in the platen Specification of Letters Patent.

Patented may 12,

1918. Serial No. 266,200.

ame 8. The platen frame forms part 1' a carriage 9, said carriage having pivoted hereon a rack 10 meshing with a pinion connected to an escapement wheel 12, so at the carriage may be fed along thereby the left at each actuation of any key 1, here being provided for this purpose the rsual dogs 13 and the spring barrel (not siown). in order to actuate the dogs 13,

re is a universal bar 1% fast to a segment 15, which is adapted to be struck by heels 16 on the type-bars a as they approach the platen, and thereby Vibrate the dogs rearwardly.

ll riting is normally done with the lowercase type 5. ll hen it is desired to write in upper case, a shift-key 1'? on the front end of a key-lever 18 is depressed, so that an upstanding arm 19, at the rear end of its lever, will rock a bell-crank 20, forming part a frame which also includes the can riage-shift rail 91. When a key is thus depressed, to lift the rail 91, the platen frame 8 is shifted umvardly, because it runs by a wheel on the rail 21, and is guided in vertical direction by the usual. arms journaied at 2% at the rear of the carriage 9.

Znv order to enable the typist to quickly and accurately identify the position of the characters written on a work-sheet passed around the platen 7, there is provided a scale-plate adjacent the platen and graduated at letter-space intervals to correspond to the spacing of the front scale 26. The scale-plate is relatively short and comprises two ings extending on either side of a slot at the type-guide 28, the slot being deep enough to allow the lowercase type 5 to be clear of the scale-plate 25 when writing in upper-case position.

To enable the scale to rise with the platen when the latter is raised by the rail 21, the bellcrank 20 is provided with a plate 29 on which is fast a forwardly-extending arm 30 connected to the dependent arm 31 of a long transverse bail-like member 32, which includes the scale 25, the connection including a link 33 pivoted to a guide arm which latter is pivot-ally mounted at on a bracket 36. To enable both ends of the bail or member 32 to be raised at once, there is a bell-crank 20 at the other end of the machine, which may be precisely like the first bell-crank, and also provided with an arm 30 connected by a link 33 t0 novided in order to enable the scale-plate 2.5 to le located in its proper position behind the type-{guide 28 ad acent the platen.

in o: lei. to hold the scale-plate 25 in pos1- on .djacent the platen and tolreep it clear f type-guide 28 and the ribbon-carrier are provided a pair of pivoter. a ms ch are adapted. to hear against the 3? an... 38, respectively, and hold the l e against the platen. To enable e arms l2 to do this, each arm is shown a small end projection a l enter an opening 45 in its rod 3'7 and hearii'igr against the edge of that v w a heel so, which be camdesired, in order to make-it bear against the rod 37 or 38, as the i In order that the scale-plate 'ally vertically with i, which itself moves vertically, the pivoted on forwardly-projecting downwardly-projecting are screwed to the face of e segment ll, and which have upturned can '19 into which are threaded shouldered. screws 50 adapter. to form pivots for the in order to make of each dependent 31, talren with its adjacent arms 34 and 88, a oua i-p allel motion. device, the brackets on which he arms 34: are pivoted extend rear-wan 7 from tl e inner face of the n a chine frame to which they are held hy l helow or slip may he.

11079 suostanti BIO?) V ly' in frontof the pivots 50. r an adjustment of 1 wing; arms to vary fie ans e or the link the arms 3 L may l formed of two pieces and 53, and he held together hy screws 5% threaded into the .e I ano adapted to pass through e ongated slots in the member 52. Such an; ustmentis possible becausethelinlrs may he nearly vertical, and, therefore, llow for consid isle adjustment to and fro of ;he arms 8- Since the'vertical arms 31 :r-e pivoted on screws 56 threaded into the members the member 53 is provided with an additional slot 5? to prevent the pivot 56 from interferingwith the aforesaid adj ustmcnt.

Since the bail member 32 is long, and prererahly rather light, and includes an offset bend 58 at each end to bring the to proper position. the hail member is provided with means adapted 1:01 resist the shock of a work-sheet which may he s 51., so "natthe pivots 35 are nearly In the present disclosure, this means for" receiving the shock is shown as a link 59 pivoted on an ear ()0 of the bail memher 8:2, said link extending to the adjacent bracket a? to which it is pivoted by an upturned ear engaged by a. headed screw 61. The link 59 has its pivots 60 and 61 so related that they cause the scale-plate 25 to hear the same relation to the type-guide in both its upper and low positions To effect this, the pivot (30 is sonfiewhat below the pivot 61 in the lower-case printing position.

Variations may he resorted to within the scope of the invention, and portions of the im n'orements may he used without others.

Having thus described my invention, 1 claim:

1. In a typewriting machine, the combination with. a platen and a shift-frame there- 1" or, of a type-guide, a. scale extending across the type-guide between the platen and the type-guide and having: depending; arms. linkages between said shift-frame and said arms for shifting said scale correspondingly when said platen is shifted, and a link oted to the fame of the machine and con.- nected to the scale for guiding the scale relatively to the platen. v

2 in a type *riting machine, the co'mbina tion with a shiftahlc platen, a scale and a shift-frame therefor. of arms pivoted at the the shifting frame to shift the scale with the platen.

o. In a typewriting machine, the combination with a shiftal le platen, a scale and a sl lit-frame therefor, of arms pivoted at the front of the machine for holding the scale :1Q'i.iii& tthe platen. links connected to the shift-frame, second arms pivoted to the iinlrs, dependent arms connected to the second arms and fast to the scale to cause the shi frame to shift the scale with the platen,

adapted with the pl atcn.

d. The combination with machine, of a platen, a shift-frame therefor, arms at each end of the'machine and pivoted at the front of the machine, depending arms connected to the pivoted arms, a scale fast to the depending arms, and a connection from the shift-frame'to the depending arms. l

5. In a typewriting machine, the combination with a platen and a shift-frame therefor, of a scale,armspivoted at the front of a typewriting the machine, adjustable links connecting the shift-frame to the arms, other arms pivoted at the front of the machine, and rods fast to the scale and having depending arms connecting said pivoted arms and forming a quasi-parallel motion device with the pivoted arms.

, 6. in a typewriting machine, the combination with a platen, of a shift-frame having ends, a scale, rigid extensions of said scale extending to points adjacent the ends of the frame and including depending arms, means connecting the arms to the frame, and means for guiding the scale. I

7. In a typewriting machine, the combination with a platen, of a shift-frame having ends, a. scale, rigid extensions of said scale extending to points adjacent the ends of the frame and including depending arms, second set of arms pivoted to the machine frame, said second arms being pivoted to said depending arms, and links connecting the second arms to the shiftframe.

8. In a typewriting machine, the combination with a platen, of a shift-frame having ends, a scale, rigid extensions of said scale extending to points adjacent the ends of the frame and including depending arms, means connecting the arms to the frame, and guide arms pivoted to the frame of the machine at the front to guide the scale.

9. In a typewriting machine, the combination with a platen, of a shift-frame hav in ends, a scale, rigid extensionsof said SCiUQ extending to points adjacent the ends of the frame and including depending arms, a second set of arms pivoted to the ine frame, said first arms pivoted mac. 7. to'said sec ond arms, links connecting the second arms to the shift-frame, and guide arms pivoted to the frame of the machine at the front to guide the scale. V

10. in a typewriting machine having a platen, the combination with a segment, of bracket arms projecting forward from the segment, swinging arms pivoted at the ends of the bracket arms, a scale held adjacelt the platen bv the swinging arms, a shiftframe comprising ends, and a linkage from each end of the shift-frame connected to the scale to cause the scale to shift with the shift-frame.

11. In a tvpewriting machine having platen, the combination with a segment, of

bracket arms projecting forward from the segment, swinging arms pivoted at the ends of the bracket arms,a scale held adjacent the platen by the swinging arms, a shiftframe comprising ends, guide arms also pivoted at the front of the machine, said scale having depending arms extending from the swinging arms to the guide arms, and links connecting the guide arms to the shiftframe.

12. In a typewriting inachine,the combination with a segment, of bracket'arms projecting from said segment near the printing point, a shiftable platen, swinging arms pivoted on the bracket arms, a scale held adjacent the platen by the swinging arms, means for shifting said swinging arms in unison with the shifting platen, and a link for holding the scale against endwise movement.

13. in a typewriting machine having a platen, the combination with a segment, of bracket arms projecting forward from the segment, swinging arms pivoted at the ends of the bracket arms, a scale held adjacent the platen by the swinging arms, a shiftframe comprising ends, and a linkage from each end of the shiftframe connected to the scale to cause the scale to shift with the shift-frame.

14.. In a typewriting machine having a platen, the combination with a se ment, of bracket arms projecting forward from the segment, swinging arms pivoted at the ends of the bracket arms, a scale held adjacent the platen by the swinging arms, a shiftframe comprising ends, guide arms also pivoted at the front of the machine, links extending from the swinging arms to the guid arms, links connecting the guide arms to the shift-frame, and a link for holding the Pale against endwise movement.

15. In a typewriting machine having a. platen, the combination with a segment, of bracket arms projecting forward from the segment, swinging arms pivoted at the. ends of the bracket arms, a scale held adjacent the platen by the swinging arms, a shi frame comprising ends, a linkage from ea n end of the shift-frame connected to the scale to cause the scale to shift with is, 1-1-4 inc sinnframe, and a link pivoted to the segment and a scale arm to hold the scale against endwise movement.

id, in a type writing machine having a platen, the combination with a segment, of bracket arms projecting forward from the segment, swinging arms pivoted at the ends of the bracket arms, a scale held adjacent the platen by the swinging arms, a shiftframe comprising ends, guide arms also pivoted at the front of the machine, links extending from the swinging arms to the guide arms, links connecting the guide arms to the shift-frame, and a link pivoted to the segmentand a scale arm to hold the scale against endwise movement.

17. in a typewriting machine. the combi nation with a platen and a shift-frame therefor, of a type-guide, a scale extending across the type-guide between the platen and the type-guide and having depending arms, linkages between said shift-frame and said arms for shifting said scale correspondingly when said platen is shifted, a link pivoted to the frame of the machine and connected movement.

19. in a typeivrlting machine having a causing the scale as it shifts to shift with the platen, a link pivoted to the scale, and a fixed pivot for said last-named link to enable the linkto hold the scale against .endWise platen and a shift-frame comprising ends, the combination with a scale adjacent said platen, means for mounting said scale inclepende'ntly of said platen, said means comprising a parallelanotionlinkage at each.

of said linkages to the corr end of the scale, and a link connecting each esponding end of the shift-frame to raise said scale when said frame is shifted. V V

20. In a typewriting machine having a platen and a shift-frame comprising ends, the combination with a segment, of brackets fixed to said segment, a scale adjacent said platen, means for mounting said scale independently of said platen comprising a parallel-motion linkage at each end of the scale, said linkages each comprising a link pivoted to the frame of the machine, a second'link. pivoted at one end to the first link and fixed to the scale at its other end, a third link pivoted at one end to a bracket on the segment and projecting through said second link at its other end, and a link connecting each of said linkages'to the corresponding end of the shiftframe to raise said scale when said frame is shifted.

21. In a typewriting machine havinga platenand a shift=frame comprisingends, the combination with a segment, of brackets fixed to said segment, a scale adjacent said platen, means for mounting said scale int c pendently of said platen comprising a parallel-motion linkage at each end of the scale,

said linkages each comprising a linkpivoted to the frame of the machine, a second l nk pivoted at one end to the first link and fixed to the scale at its other end, a third link pivoted at one end to a, bracket on the segment and projecting through said second link at its other end, a link connecting each of said linkages to the corresponding end of the shift-frame to raise said scale When said frame is shiftechand means for varying the length of the link pivoted to the frame of the machine to vary the amount of shift of the scale. 7

22. In a typevvriting' machine having a platen and a shift-frame'comprising ends, the combination Witha segment, of brackets fixed to said segment, a scale. adjacent said platen, means for mounting the scale inde pendently of said platen comprising a parallel-motion linkage at each end of thescale, said linkages each comprising a link pivoted at its other end to one of said bracketsto prevent endvvise movement of the scale.

23. In a typewritingmachine having a platen, the combination Witha segment having brackets thereon, of ascale adjacent said platen, a shift-frame comprising ends, and means for shifting the scale When said platen is shifted and tively to the platen, said means comprising links pivoted to the frame of the machine, second links connecting the first links to the ends of the shift-frame, depending members fixed to the scale and pivoted on said first links, and third links pivoted on the brackets on the segment and projecting through the depending members. V J OH'N'C. DOANE. \Vitnesses i' i FRANK A. .CooK, LYMAN D. BROUGHTON.

guiding the scale rela- 

